L. Agassiz on Fishes of the Tennessee River. 357 
ee since by Prof. Baird and myself.* te Newman has sent 
another undescribed species, which I call 
inichthys obtusus, Agass.—Body cylindrical, slightly com- 
pressed, more blunt than in Rh. marmoratus. The mouth ex- 
tends but little beyond the margin of the upper jaw; lower jaw 
strongly arched from side to side. Eyes rather large and nearer 
the end of the snout than the posterior angle of the opercle. 
Dorsal exactly intermediate between the ventrals and the anal, 
quadrangular, its last rays about two-thirds the length of the fish, 
so that when the fin is folded backwards their ends meet. Pec- 
torals broadly rounded behind ; do not reach the base of the ven- 
tals, Caudal not very deeply fureate ; its lobes are broad, rather 
than slender, the lower lobe is senerally a little the longer. The 
color of the ‘body i is dark chocolate above, and of a silvery white 
below; these two colors are separated by a longitudinal band of 
a darker color than the back, extending from the end of the snout 
through the eye in a direct line along the sides to the middle of 
the base of the caudal. The whole dorsal region is mottled with 
black blotches, sometimes running together “and forming large 
patches, and often descending to the lighter portion of the sides. 
Scales rather small. Called Minnow at Huntsville. Found in 
the Spring branch. 
_Cuonprostoma, Agass.—This genus was established by me in 
1834 in the Mémoires de la Société des Sc. Nat. de Neuchatel, 
for the Cyprinus Nasus of Europe, and has been adopted with 
Various modifications by subsequent writers. Thus far no repre- 
sentative of this type had been known to exist in North America, 
though the species I now refer to it here, has been described for 
sometime by Dr. D. H. Storer; but having been referred to the 
senus Leuciscus, to which C. Nasus was also referred formerly, 
it has not been distinguished from the ordinary Leucisci. I nee 
only allude to it for “the present.t Other species occur in the 
tesh waters of the Pacific coast of North America. Hzoglossum 
dubium, Kirtl. , may belong to this genus. 
SS iedristoma prolicum, Agass.—Leuciscus prolixus, Storer, 
Synops., page 165. Called Minnow at Huntsville. Found in the 
Spring branch. 
* Lam indebted for another new species of this genus to Dr. I. H. Rauch, of Bur- 
lington, Towa, _— I would call R. —— Ag. It is go tages lag short noe] stout 
a i ts congeneric types, also smaller. The whole bo yi is dotted bbe 3 
= ad a Wirary ground, the dots got confluent; the belly only is plain sil. 
+1 ow S spoter entirely new species * this genus to Dr. I. H. Rauch, o of Bur- 
lington, Tos Towa; which I inscribe as Ch. pu lum, se a is the smallest species of ne 
8enus; much ere than the others in compari © its length; head es 
Small, eee indicating isiinet generic ectliagition oe which I am however una- 
ae enquire from want of a sufficient number of specimens. This ef a 
18 of a peculiar deep but dull green, darker above, passing into yellowish white 
Szcoxp Srnres, Vol. XVII, No. 51.—May, 1854. 46 
